Production of tetrabasic lead sulfate from solid state reactions for the preparation of active plates to be used in lead-acid batteries

a technology of solid state reactions and lead sulfate, which is applied in the manufacture of final products, lead sulfates, cell components, etc., can solve the problems of complex production methods, high cost, and heterogeneous crystal sizes of tetrabasic lead sulfate, and achieve the effect of avoiding any further milling of material

Active Publication Date: 2006-03-14
CPS TECH HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]The procedures indicated in the present invention allow to obtain particles of tetrabasic lead sulfate having a size of less than 10 μm, avoiding any further milling of the material and requiring only the employment of a dispersion process, which can be carried out either under dry conditions or in a liquid suspension.

Problems solved by technology

In brief, the available methods for the production of tetrabasic lead sulfate are complex, costly or yield heterogeneous crystal sizes.

Method used

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  • Production of tetrabasic lead sulfate from solid state reactions for the preparation of active plates to be used in lead-acid batteries
  • Production of tetrabasic lead sulfate from solid state reactions for the preparation of active plates to be used in lead-acid batteries

Examples

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example 1

[0026]Five mole of lead oxide were intimately mixed up with four mole of lead sulfate. A heat treatment of the reacting mixture at 600° C. for 4 hours made it possible to achieve a degree of transformation of 95%.

3PbO.PbSO4.H2O+PbO+thermal treatment→4PbO.PbSO4+H2O

[0027]In this case a solid state reaction method is proposed for the production of tetrabasic lead sulfate by reacting 3PbO.PbSO4.H2O+PbO. This method comprising the steps of mixing of the stoichiometric mixture of 3PbO.PbSO4.H2O+PbO, heating the stoichiometric mixture of 3PbO.PbSO4.H2O+PbO at a temperature between 500 and 700° C. during 3 to 8 hours and finally deagglomerating and sieving the resulting tetrabasic lead sulfate.

example 2

[0028]A degree of transformation into tetrabasic lead sulfate of 83.4% was achieved by heat treating at 600° C. for 5 hours a mixture of one mole of tribasic lead sulfate with one mole of lead oxide.

[0029]An alternative method to this chemical route to produce tetrabasic lead sulfate is as follows:

[0030]Either by using active materials coming from the pastes used for the preparation of the lead-acid battery plates, or coming from recycled lead-acid battery plates. In this case, a solid state reaction method is proposed for the production of tetrabasic lead sulfate by reacting 3PbO.PbSO4.H2O+PbO. This method comprises the steps of mixing either the paste used for the preparation of the lead-acid battery plates, or the paste recovered from recycled lead-acid battery plates, heating the mixture at a temperature between 500 and 700° C. during 3 to 8 hours, and finally deagglomerating and sieving the resulting tetrabasic lead sulfate.

example 3

[0031]A degree of transformation into tetrabasic lead sulfate of 93% was achieved by heat treating at 650° C. for 5 hours the active materials coming from recycled lead-acid battery plates.

5PbO+H2SO4+thermal treatment→4PbO.PbSO4+H2O

[0032]In this case a solid state reaction method is proposed for the production of tetrabasic lead sulfate by reacting 5PbO+H2SO4. This method comprising the steps of mixing the PbO with 1 mole of a H2SO4 aqueous solution having a specific gravity in the range of 1.100 to 1.400 g / cm3, following this by a temperature rise of the stoichiometric mixture to 500–700° C., holding the mixture at that temperature for 3 to 8 hours, and finally deagglomerating and sieving the resulting tetrabasic lead sulfate.

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Abstract

The production of tetrabasic lead sulfate by means of solid state reactions at high temperatures allow the formation of powders having a particle size of less than 10 μm. In the methods the chemical reaction that takes place between lead oxide and different sulfated compounds occurs in a single high temperature treatment. The sulfated compounds used in the present invention to produce the tetrabasic lead sulfate are: PbSO4, 3PbO.PbSO4.H2O, H2SO4 and (NH4)2SO4. There are lead-acid battery pastes produced using the tetrabasic lead sulfate made, the lead-acid battery plates made with the pastes, and the lead-acid batteries subsequently made with the plates.

Description

RELATED U.S. APPLICATIONS[0001]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.REFERENCE TO MICROFICHE APPENDIX[0003]Not applicable.FIELD OF THE INVENTION[0004]This invention relates generally to the production of tetrabasic lead sulfate and more specifically to the production of tetrabasic lead sulfate from solid state reactions for the preparation of active plates to be used in lead-acid batteries.BACKGROUND OF THE INVENTION[0005]The preparation of active electrodes or plates for lead-acid batteries involves three steps: a) paste application to a supporting grid, b) drying and curing of the pasted grid, and c) electrochemical formation of the cured grid to produce the active materials used in the charged lead-acid battery. Battery formation is usually carried out by passing current through the electrode, which results in a positive plate having pellets of lead dioxide, and a negative plate having pellets of metallic lead. Tetrabas...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C01G21/20H01M10/12H01M4/16H01M4/56H01M4/20H01M4/58
CPCC01G21/20H01M4/20H01M4/56C01P2002/72C01P2004/03C01P2004/61Y10T29/49108Y02E60/126Y10T29/49115C01P2006/40Y02E60/10Y02P70/50
Inventor FLORES-LIRA, RICARDOGARZA-DE LA GARZA, SANJUANA
Owner CPS TECH HLDG LLC
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